In order to provide high-quality diesel which are qualified
for off gas standard, refining companies normally utilize following
methods: 1) adopt high quality desulfurize catalyst to remove
dimethyl acetopheonone and other sulfur compounds; 2) to adopt
sulfur resisting arene catalyst to make the saturation of arene
and hydrogen is performed is under pressure, cost will be extremely
reduced by this method; 3) the technology to raise cetane index.
With these methods, bio-diesel quality will easily achieve ¡°international
fuel standard¡± diesel standard II or III.
The regular petroleum diesel fuel has a carbon chain that contains 15 carbon
atoms. Plant oils have carbon chains that range from 14 to 18 carbon atoms in
length, similar to that of diesel fuel. Therefore, the biodiesel is a new fuel
which can be refined from renewable vegetable oils. According to the analysis
on chemical composition, biodiesel is a mixture of fatty acid methyl esters obtained
from transesterification of triglyceride rapeseed oil with methanol. Biodiesel
owns superseding performance compared with ordinary diesel, details are as follows.
1) Nice environment-protection characterics: since the lower sulfur contents,
emission of sulfur dioxide and sulfide by biodiesel will be reduced by 30%, or
70% in case of catalyzers involved. As the biodiesel contains no environment-polluted
content like aromatic paraffin, less damage than petroleum diesel to human. Biodiesel
is able to reduce air toxins by 90%, and the cancer rate by 94% compare with
ordinary diesel. Biodiesel fuel has naturally high oxygen content that facilitates
the combustion process, leading to lower carbon monoxide output by 10% compared
with petroleum diesel, or by 95% in case of catalyzers involved. The degradation
degree of biodiesel is quite high.
2) Capable of initiating engine at lower temperature: CFPP (Cold Filter Plugging
Point) could reach 20 Celsius degree under zero without additive treated.
3) Well lubricated performance: it will reduce the wearing rate of injection
pump, engine stator and connecting rod clevel and lengthen their life cycle.
4) Better safety property: with higher flash point, biodiesel is more safer for
transportation, storage, and usage.
5) Well combustion performance: with higher cetane number, combustion performance
of biodiesel is better than that of diesel, besides, slight acid property of
combustion residue lengthen engine¡¯s life.
6) Renewable: as a renewable energy, the supply will not be exhausted with efforts
of agricultural and biological scientists.
The indicators of waste emission by biodiesel engine not only meet the requirements
of Europe II, but also more strict emission standard of Europe III. Carbon dioxide
emission during combustion of biodiesel is much lower than Carbon dioxide absorption
during plant growth, thus improving the green house effect which is harmful for
the human beings. All in all, biodiesel is the real ¡°green diesel¡±.
